CN205330850U

CN205330850U - Gas and EGR be system of spouting directly jointly

Info

Publication number: CN205330850U
Application number: CN201620116646.0U
Authority: CN
Inventors: 徐敏; 程伟; 张宏飞; 李智; 安涛
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2016-02-05
Filing date: 2016-02-05
Publication date: 2016-06-22
Anticipated expiration: 2026-02-05

Abstract

The utility model provides a gas and EGR be system of spouting directly jointly, its middle and low voltage EGR union coupling blast pipe and high -pressure EGR pipe, install low pressure EGR valve on the low pressure EGR pipe, install high -pressure EGR valve on the high pressure EGR pipe, the import of EGR pump be connected with exhaust manifold through high -pressure EGR pipe, EGR pumps the mouth and is connected with the EGR air track import, the EGR air track export is connected with the EGR nozzle through the EGR feed pipe, EGR nozzle install is on the cylinder or near in the intake duct of cylinder, liquefaction gas bottle export be connected with the import of gas pump, the gas is pumped mouthful and is fired the air track import and be connected, fires the air track export and manages through fuel gas supply and be connected with the gas burner, gas nozzle install is on the cylinder or near in the intake duct of cylinder.

Description

A kind of combustion gas and EGR combine direct-injection system

Technical field

This utility model relates to a kind of direct-injection system, combines direct-injection system more specifically to a kind of combustion gas and EGR, belongs to exhaust gas recirculatioon (EGR) and the gas supply system technical field in gas engine field。

Background technology

At present, in the face of increasingly severe environmental crisis, various countries are increasingly stricter to the requirement of Abgasgesetz, and therefore emissions-reducing becomes the Main way of internal combustion engine development。Coming into one's own gradually with the cleaning fuel that natural gas is representative, big quantity research shows that adopting the gas engine of cleaning fuel to discharge more traditional petrol and diesel oil machine is greatly reduced；Simultaneously the cleaning fuel such as natural gas can to a certain degree alleviate China's demand to oil as a kind of alternative fuel。On the other hand, egr system is as reducing internal combustion engine NO_xEffective emission controls by improving combustion measure of discharge, is also one of the important technology route of low emission gas engine。Traditional egr system, by setting up EGR circuit between exhaustor and air inlet pipe, introduces exhaust gas into gas handling system and mixes with fresh charge, then enters with fresh charge and participates in burning in cylinder, it is achieved the control to fire emission。This traditional egr system simple possible, but, there is following problem in it: on the one hand, and egr system exists operating lag effect, accelerating or loading procedure being likely to occur excessive EGR rate, emission is caused to steeply rise, incomplete combustion, instability are even caught fire；On the other hand, when EGR rate is bigger, a large amount of aerofluxuss are incorporated into air inlet pipe, the mixed effect of aerofluxus and fresh charge is deteriorated, causing EGR mixing and each cylinder EGR distribution inequality, make part cylinder concentration of emission too high and combustion instability, discharge and performance to electromotor all have a negative impact。

Chinese Patent Application No. is 201120382503.1, name is called that the utility model patent of " exhaust gas recirculation structure of a kind of Diesel engine " describes the egr of a kind of Diesel engine, it, by increasing EGR distribution pipe between EGR valve and inlet manifold, makes the EGR rate of each cylinder be easier to reach uniformly。Chinese Patent Application No. is that CN201210080055.9, name are called that the patent of invention of " method and system that a kind of EGR of solution drives stagnant ring " describes a kind of EGR that solves and drives the method and system of stagnant ring, it is by setting up the contact between the variation tendency of the actually required aperture of EGR and EGR characteristic curve, eliminates EGR that is inconsistent due to variation tendency and that cause and drives hysteresis。But, above-mentioned patent is the improvement to convention EGR systems, it is impossible to fundamentally solve the problems such as EGR delay and EGR amount accurately control；Therefore, still do not have a kind of method can solve under transient condition the problems such as the operating lag of EGR well at present, under transient condition egr system accurately control be still that one urgent need to solve the problem of field of internal combustion engine。

Summary of the invention

The purpose of this utility model is in that for problems such as the delay of existing egr system, EGR amount accurately controls, it is provided that a kind of combustion gas and EGR combine direct-injection system。

For achieving the above object, technical solution of the present utility model is:A kind of combustion gas and EGR combine direct-injection system, including compressor, turbine, air intake intercooler, electromotor, cylinder, low pressure EGR tube, described compressor air inlet machine mouth is connected with air inlet pipe, compressor gas outlet is connected with air intake intercooler import by compressor escape pipe, described air intake intercooler outlet is connected with electromotor by inlet manifold, described turbine inlet is connected with electromotor by exhaust main, turbine outlet is connected with exhaustor, pass through to be connected axle between described compressor and turbine to be connected, also include high pressure EGR tube, EGR pump, EGR gas rail, EGR nozzle, liquefaction gas bottle, gas pump, combustion gas rail and gas nozzle, described low pressure EGR tube connects exhaustor and high pressure EGR tube, low pressure EGR tube is provided with low pressure EGR valve, high pressure EGR tube is provided with high pressure EGR valve, described EGR pump inlet is connected with exhaust main by high pressure EGR tube, EGR pump discharge is connected with EGR gas rail import, described EGR gas rail outlet is connected with EGR nozzle by EGR supply pipe, described EGR nozzle is arranged on cylinder or in the air intake duct of cylinder, described liquefaction gas bottle outlet is connected with gas pump import, described gas pump outlet is connected with combustion gas rail import, described combustion gas rail outlet is connected with gas nozzle by gas supply pipe, described gas nozzle is arranged on cylinder or in the air intake duct of cylinder。

Also include cooler, described cooler EGR import is pumped trachea by EGR and is connected with EGR pump discharge, cooler EGR outlet is connected with EGR gas rail import by EGR gas rail connecting tube, described cooler fuel gas inlet is connected with gas pump outlet by gas pump escape pipe, and cooler gas outlet is connected with combustion gas rail import by combustion gas rail connecting tube。

Also including EGR filter, described EGR filter inlet is connected with high pressure EGR tube, and EGR filter outlet is connected with EGR pump inlet by EGR pump air inlet pipe。

Also include gas filter, described gas filter is arranged between liquefaction gas bottle and gas pump, gas filter import is connected with the outlet of liquefaction gas bottle by gas header pipe, gas filter outlet is connected with gas pump import by gas pump air inlet pipe, and described gas header pipe is provided with gas pressure-reducing valve。

Compared with prior art, the beneficial effects of the utility model are:

1, in this utility model, EGR pump inlet is connected with exhaust main by high pressure EGR tube, EGR pump discharge is connected with EGR gas rail import, the outlet of EGR gas rail is connected with EGR nozzle by EGR supply pipe, and EGR nozzle is arranged on cylinder or in the air intake duct of cylinder；The outlet of liquefaction gas bottle is connected with gas pump import, and gas pump outlet is connected with combustion gas rail import, and the outlet of combustion gas rail is connected with gas nozzle by gas supply pipe, and gas nozzle is arranged on cylinder or in the air intake duct of cylinder。Overlap gas rail by combustion gas rail 33 and 22 liang of EGR gas rail, and maintain pressure in combustion gas rail and EGR gas rail respectively through gas pump and EGR pump；Accurately control combustion gas by combustion gas and EGR nozzle and EGR enters in cylinder the moment, sprays into combustion gas and EGR amount in cylinder, realize the quick response of combustion gas and EGR, it is prevented effectively from combustion gas and EGR operating lag, eliminates the unequal problem of response lag and Ge Gang branch of conventional gas supply and egr system。

2, the exchanger in this utility model utilizes combustion gas cold that EGR is cooled down, and decreases the gasification demand for heat of low temperature combustion gas and the cooling requirement of high temperature EGR, improves engine power utilization ratio。

3, this utility model establishes high pressure and two kinds of EGR circuit of low pressure, controls EGR pumping gas mode by controlling high pressure EGR valve and low pressure EGR valve, it is achieved that take gas strategy flexibly。

Accompanying drawing explanation

Fig. 1 is this utility model structural representation。

In figure, air inlet pipe 1, compressor 2, connect axle 3, turbine 4, compressor escape pipe 5, air intake intercooler 6, inlet manifold 7, electromotor 8, cylinder 9, exhaust main 10, exhaustor 11, low pressure EGR tube 12, low pressure EGR valve 13, high pressure EGR valve 14, high pressure EGR tube 15, EGR charge air cooler 16, EGR pump air inlet pipe 17, EGR pump 18, EGR pumps trachea 19, cooler 20, EGR gas rail connecting tube 21, EGR gas rail 22, EGR supplies pipe 23, EGR nozzle 24, liquefaction gas bottle 25, gas header pipe 26, gas pressure-reducing valve 27, gas filter 28, gas pump air inlet pipe 29, gas pump 30, gas pump escape pipe 31, combustion gas rail connecting tube 32, combustion gas rail 33, gas supply pipe 34, gas nozzle 35。

Detailed description of the invention

Illustrate with detailed description of the invention, this utility model to be described in further detail below in conjunction with accompanying drawing。

Referring to Fig. 1, a kind of combustion gas and EGR combine direct-injection system, including compressor 2, turbine 4, air intake intercooler 6, electromotor 8, cylinder 9, low pressure EGR tube 12, high pressure EGR tube 15, EGR pump 18, EGR gas rail 22, EGR nozzle 24, liquefaction gas bottle 25, gas pump 30, combustion gas rail 33 and gas nozzle 35。Described compressor 2 air inlet is connected with air inlet pipe 1, and compressor 2 gas outlet is connected with air intake intercooler 6 import by compressor escape pipe 5；Described air intake intercooler 6 is exported and is connected with electromotor 8 by inlet manifold 7。Described turbine 4 import is connected with electromotor 8 by exhaust main 10, and turbine 4 outlet is connected with exhaustor 11；Pass through to be connected axle 3 between described compressor 2 and turbine 4 to be connected。Described low pressure EGR tube 12 connects exhaustor 11 and high pressure EGR tube 15, and low pressure EGR tube 12 is provided with low pressure EGR valve 13；High pressure EGR tube 15 is provided with high pressure EGR valve 14。Described EGR pump 18 import is connected with exhaust main 10 by high pressure EGR tube 15, and EGR pump 18 outlet is connected with EGR gas rail 22 import。Described EGR gas rail 22 is exported and is connected with EGR nozzle 24 by EGR supply pipe 23, and described EGR nozzle 24 is arranged on cylinder 9 or in the air intake duct of cylinder 9；EGR nozzle 2 is arranged close in the air intake duct of cylinder 9 and realizes air intake duct direct-injection, good response characteristic can be obtained。Described liquefaction gas bottle 25 outlet is connected with gas pump 30 import, described gas pump 30 outlet is connected with combustion gas rail 33 import, described combustion gas rail 33 is exported and is connected with gas nozzle 35 by gas supply pipe 34, and described gas nozzle 35 is arranged on cylinder 9 or in the air intake duct of cylinder；Gas nozzle 35 is arranged close in the air intake duct of cylinder 9 and realizes air intake duct direct-injection, good response characteristic can be obtained。

Referring to Fig. 1, further, also including cooler 20, described cooler 20EGR import is pumped trachea 19 by EGR and is connected with EGR pump 18 outlet, and cooler 20EGR outlet is connected with EGR gas rail 22 import by EGR gas rail connecting tube 21。Described cooler 20 fuel gas inlet is connected with gas pump 30 outlet by gas pump escape pipe 31, and cooler 20 gas outlet is connected with combustion gas rail 33 import by combustion gas rail connecting tube 32。

Referring to Fig. 1, further, also including EGR filter 16, described EGR filter 16 import is connected with high pressure EGR tube 15, and EGR filter 16 is exported and is connected with EGR pump 18 import by EGR pump air inlet pipe 17。

Referring to Fig. 1, further, also including gas filter 28, described gas filter 28 is arranged between liquefaction gas bottle 25 and gas pump 30。Gas filter 28 import is connected with liquefaction gas bottle 25 outlet by gas header pipe 26, and gas filter 28 is exported and is connected with gas pump 30 import by gas pump air inlet pipe 29；Described gas header pipe 26 is provided with gas pressure-reducing valve 27。

Referring to Fig. 1, this utility model establishes combustion gas and EGR common rail system, utilize gas nozzle 35 and EGR nozzle 24 to be directly injected in cylinder by combustion gas and EGR, namely establish the associating direct-injection system that can realize inner cylinder direct injection waste gas and combustion gas, it is adaptable to multi-cylinder pressurized combustion gases machine。During work, combustion gas and waste gas pressurize respectively through gas pump 30 and EGR pump 18 and enter combustion gas rail 33 and EGR gas rail 22, and maintain certain pressure in respective gas rail；EGR nozzle 24 is connected with EGR gas rail 22 and combustion gas rail 33 respectively with gas nozzle 35, controls the moment in combustion gas and EGR entrance cylinder by controlling the opening and closing of gas nozzle 35 and EGR nozzle 24。Therefore, this utility model is by setting up combustion gas rail 33 and 22 liang of EGR gas rail set gas rail, according to the burning demand to EGR amount in cylinder 9, and respectively combustion gas and EGR are injected directly in cylinder 9 by EGR nozzle 24 and gas nozzle 35, realize accurately quickly spraying into combustion gas and EGR and in cylinder, participate in fire emission control, realize the quick response of combustion gas and EGR, avoid because between the air inlet mixing uneven each cylinder caused, combustion gas and EGR distribute unequal problem, eliminate combustion gas and the EGR response lag problem of existing egr system, solve the problem such as operating lag of EGR under transient condition, achieve the accurate control of egr system under transient condition, ensure that electromotor 8 has preferably performance and emission effect。

Referring to Fig. 1, the fuel gas injection of gas engine is combined by this utility model with EGR jet mode, it is to avoid independent combustion gas and EGR direct-injection mode, it is possible to effectively save the arrangement space in cylinder 9；Simultaneously, in this utility model, combustion gas carries out heat exchange with EGR by cooler 20, utilizes low temperature combustion gas cold that high temperature EGR is cooled down, decreases engine coolant demand, meet low temperature gas heating and high temperature EGR cooling requirement, and low temperature combustion gas simultaneously is better to the cooling effect of EGR。

Referring to Fig. 1, meanwhile, this utility model mesohigh EGR pipe 15 is connected with EGR pump 18 with low pressure EGR tube 12, and high pressure EGR valve 14 and low pressure EGR valve 13 are separately mounted on high pressure EGR tube 15 and low pressure EGR tube 12；Namely establish high pressure and two kinds of EGR circuit of low pressure, control EGR pumping gas mode by controlling the opening and closing of high pressure EGR valve 14 and low pressure EGR valve 13, it is achieved take gas strategy flexibly。

Therefore, this utility model is according to the burning demand to combustion gas and EGR amount in cylinder 9, accurately control combustion gas by mixture gas nozzle 25 and EGR sprays into air-fuel mixture amount and gaseous mixture in cylinder and enters the moment in cylinder 9, the combustion gas of required ratio is accurately quickly sprayed into EGR and in cylinder 9, participates in fire emission control, achieve the quickly accurately control to combustion gas and EGR, avoid because between the air inlet mixing uneven each cylinder caused, combustion gas and EGR distribute unequal problem, eliminate the EGR response lag problem of existing egr system, solve the problem such as operating lag of EGR under transient condition, achieve the accurate control of egr system under transient condition, ensure that electromotor 8 has preferably performance and emission effect。

Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, it is impossible to assert that of the present utility model being embodied as is confined to these explanations。For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, said structure all should be considered as belonging to protection domain of the present utility model。

Claims

1. a combustion gas and EGR combine direct-injection system, including compressor (2), turbine (4), air intake intercooler (6), electromotor (8), cylinder (9), low pressure EGR tube (12), described compressor (2) air inlet is connected with air inlet pipe (1), compressor (2) gas outlet is connected with air intake intercooler (6) import by compressor escape pipe (5), described air intake intercooler (6) outlet is connected with electromotor (8) by inlet manifold (7), described turbine (4) import is connected with electromotor (8) by exhaust main (10), turbine (4) outlet is connected with exhaustor (11), pass through to be connected axle (3) between described compressor (2) and turbine (4) to be connected, it is characterized in that: also include high pressure EGR tube (15), EGR pump (18), EGR gas rail (22), EGR nozzle (24), liquefaction gas bottle (25), gas pump (30), combustion gas rail (33) and gas nozzle (35), described low pressure EGR tube (12) connects exhaustor (11) and high pressure EGR tube (15), low pressure EGR tube (12) is provided with low pressure EGR valve (13), high pressure EGR tube (15) is provided with high pressure EGR valve (14), described EGR pump (18) import is connected with exhaust main (10) by high pressure EGR tube (15), EGR pump (18) outlet is connected with EGR gas rail (22) import, described EGR gas rail (22) outlet is connected with EGR nozzle (24) by EGR supply pipe (23), described EGR nozzle (24) is arranged in the air intake duct of the upper or close cylinder (9) of cylinder (9), described liquefaction gas bottle (25) outlet is connected with gas pump (30) import, described gas pump (30) outlet is connected with combustion gas rail (33) import, described combustion gas rail (33) outlet is connected with gas nozzle (35) by gas supply pipe (34), described gas nozzle (35) is arranged in the air intake duct of the upper or close cylinder (9) of cylinder (9)。

2. a kind of combustion gas according to claim 1 and EGR combine direct-injection system, it is characterized in that: also include cooler (20), described cooler (20) EGR inlet pumps trachea (19) by EGR and is connected with EGR pump (18) outlet, cooler (20) EGR outlet is connected by EGR gas rail connecting tube (21) and EGR gas rail (22) import, described cooler (20) fuel gas inlet is connected with gas pump (30) outlet by gas pump escape pipe (31), cooler (20) gas outlet is connected with combustion gas rail (33) import by combustion gas rail connecting tube (32)。

3. a kind of combustion gas according to claim 1 and EGR combine direct-injection system, it is characterized in that: also include EGR filter (16), described EGR filter (16) import is connected with high pressure EGR tube (15), and EGR filter (16) outlet is connected with EGR pump (18) import by EGR pump air inlet pipe (17)。

4. a kind of combustion gas according to claim 1 and EGR combine direct-injection system, it is characterized in that: also include gas filter (28), described gas filter (28) is arranged between liquefaction gas bottle (25) and gas pump (30), gas filter (28) import is connected with liquefaction gas bottle (25) outlet by gas header pipe (26), gas filter (28) outlet is connected with gas pump (30) import by gas pump air inlet pipe (29), and described gas header pipe (26) is provided with gas pressure-reducing valve (27)。